My host says that the two principal improvements introduced by foreigners have been, first, reducing by previous roasting the copper pyrites -- which, being the common ore in Cornwall, the English miners were astounded on their arrival to find thrown away as useless: secondly, stamping and washing the scoriae from the old furnaces -- by which process particles of metal are recovered in abundance.

The forty or so essays are uneven in length and quality; although there are some glints of genuine gold here and there, there is an overwhelming weight of pyrites dross to be silted through by the reader.

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